<template>
  <div>
     <!--面包屑导航 区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置相关参数" type="warning"></el-alert>
      <!--选择商品分类-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader v-model="selectedCateKeys" :options="cateList" :props="{ expandTrigger: 'hover', label: 'cat_name', value: 'cat_id', children: 'children' }" @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="isBtnDisable" @click="addDialogVisible=true" >添加参数</el-button>
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag @close="handlerClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                  {{item}}
                </el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name" ></el-table-column>
             <el-table-column label="操作">
               <template slot-scope="scope">
                 <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                 <el-button size="mini" type="danger" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete">删除</el-button>
               </template>
             </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="isBtnDisable" @click="addDialogVisible=true" >添加属性</el-button>
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag @close="handlerClose(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">
                  {{item}}
                </el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name" ></el-table-column>
             <el-table-column label="操作">
               <template slot-scope="scope">
                 <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                 <el-button size="mini" type="danger" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete">删除</el-button>
               </template>
             </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <el-dialog @close="addDialogClosed" :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--修改-->
    <el-dialog @close="editDialogClosed" :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 商品分类
      cateList: [],
      selectedCateKeys: [],
      // 被激活页签的名称
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      editDialogVisible: false,
      editForm: {},
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // tab页签点击事件的函数
    handleTabClick () {
      console.log(this.activeName)
      this.getParamsData()
    },
    async getParamsData () {
      // console.log(this.selectedCateKeys)
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数信息失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        console.log(res.meta.status)
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.error('已取消删除')
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败')
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点 or 按下的enter键
    async handleInputConfirm (row) {
      console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      // 如果没有return 则说明输入了内容，需要做后续的处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求保存操作
      this.saveAttrValues(row)
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // $nextTick 的作用：就是当页面重新被渲染之后，就会调用指定的回调函数
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async saveAttrValues (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败')
      this.$message.success('修改参数项成功')
    },
    // 删除对应的参数可选项
    handlerClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValues(row)
    }
  },
  computed: {
    isBtnDisable () {
      if (this.selectedCateKeys.length !== 3) return true
      return false
    },
    cateId () {
      if (this.selectedCateKeys.length === 3) return this.selectedCateKeys[2]
      return null
    },
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0px;
}
.el-tag {
  margin: 10px;
}
.el-input {
  width: 120px;
}
</style>>
